128200728781631 has 16 divisors (see below), whose sum is σ = 140026711668480. Its totient is φ = 116403349423680.

The previous prime is 128200728781529. The next prime is 128200728781691. The reversal of 128200728781631 is 136187827002821.

It is a de Polignac number, because none of the positive numbers 2^k-128200728781631 is a prime.

It is a super-2 number, since 2×128200728781631² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128200728781691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60703355 + ... + 62779763.

It is an arithmetic number, because the mean of its divisors is an integer number (8751669479280).

Almost surely, 2^{128200728781631} is an apocalyptic number.

128200728781631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128200728781631 is a deficient number, since it is larger than the sum of its proper divisors (11825982886849).

128200728781631 is a wasteful number, since it uses less digits than its factorization.

128200728781631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083294.

The product of its (nonzero) digits is 3612672, while the sum is 56.

The spelling of 128200728781631 in words is "one hundred twenty-eight trillion, two hundred billion, seven hundred twenty-eight million, seven hundred eighty-one thousand, six hundred thirty-one".